注意

官方文档：Running a Chainlink Node | Chainlink Documentation

  1. 本教程和官方教程的区别在于，本教程基于自己搭建的Geth私有链而非Goerli测试网
  2. 建议先在本地创建账户，再创建json文件，然后去metamask添加import account，最后再在启动私链的命令中添加–unlock参数解锁账户，实现交易的打包。这一步，目的是为在Remix上部署LinkToken合约做准备。
  3. 在metamask上添加创建的账户是为后续在Remix上部署合约做准备
  4. 在Remix上部署LinkToken合约的目的是为后续给预言机节点转账做准备

用Geth搭建私有链

下载Geth

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apt-get install software-properties-common
add-apt-repository -y ppa:ethereum/ethereum
apt-get update
apt-get install ethereum

随后创建如下的文件目录

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/myChain
├── chainlink
└── localChain
    ├── node1

输入如下命令创建账户

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sudo geth --datadir ./ account new

可以通过两种方式配置创世区块：

  • 直接配置genesis.json文件
  • 使用puppeth配置创世区块

0xedd96278959aA8B27DdC14FD70ACb31f7e7beC2F

0xCDA9035668b149d18905349Fa8779073e433820C

如果要直接配置genesis.json文件，可参考如下写法：

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{
  "config": {
        "chainId": 15,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0,
        "eip150Block": 0
    },
  "alloc"      : {},
  "coinbase"   : "0x0000000000000000000000000000000000000000",
  "difficulty" : "0x20000",
  "extraData"  : "",
  "gasLimit"   : "0x2fefd8",
  "nonce"      : "0x0000000000000042",
  "mixhash"    : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "parentHash" : "0x0000000000000000000000000000000000000000000000000000000000000000",
  "timestamp"  : "0x00",
  "alloc": {
    "18aCF602A4C1f4915709bA09A0bFd83A58656CA4": { "balance": "300000000000000000000" },
    "8c304567E5d337cB60301a998e430F056EF9F622": { "balance": "400000000000000000000" }
  }
}

初始化。注意每次修改JSON文件后都必须初始化

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geth init --datadir data testchain.json

在~/myChain/localChain/node1下启动私链

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geth --datadir data --gcmode "archive" --syncmode=full --networkid 4190 --http --http.addr 0.0.0.0 --http.port 6789 --http.corsdomain "*" --ws --port 30305 --allow-insecure-unlock --unlock edd96278959aA8B27DdC14FD70ACb31f7e7beC2F --keystore ./keystore console

私链启动以后，就去Metamask添加网络。

Metamask具体可以看这篇：https://blog.csdn.net/llslinliansheng/article/details/123596009

私链开启挖矿

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miner.setEtherbase("edd96278959aa8b27ddc14fd70acb31f7e7bec2f")
miner.start()

搭建Chainlink预言机

由于LinkToken.sol的Solidity代码需要在GitHub拉取，可以通过在主页按T键搜索LinkToken.sol文件，找到文件所在目录，并拉取其V0.4的所有文件。同时要修改import部分：

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pragma solidity ^0.4.11;

import "https://github.com/smartcontractkit/chainlink/contracts/src/v0.4/ERC677Token.sol";
import { StandardToken as linkStandardToken } from "https://github.com/smartcontractkit/chainlink/contracts/src/v0.4/vendor/StandardToken.sol";


contract LinkToken is linkStandardToken, ERC677Token {

  uint public constant totalSupply = 10**27;
  string public constant name = "ChainLink Token";
  uint8 public constant decimals = 18;
  string public constant symbol = "LINK";

  function LinkToken()
    public
  {
    balances[msg.sender] = totalSupply;
  }

  /**
  * @dev transfer token to a specified address with additional data if the recipient is a contract.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  * @param _data The extra data to be passed to the receiving contract.
  */
  function transferAndCall(address _to, uint _value, bytes _data)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transferAndCall(_to, _value, _data);
  }

  /**
  * @dev transfer token to a specified address.
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint _value)
    public
    validRecipient(_to)
    returns (bool success)
  {
    return super.transfer(_to, _value);
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value)
    public
    validRecipient(_spender)
    returns (bool)
  {
    return super.approve(_spender,  _value);
  }

  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value)
    public
    validRecipient(_to)
    returns (bool)
  {
    return super.transferFrom(_from, _to, _value);
  }


  // MODIFIERS

  modifier validRecipient(address _recipient) {
    require(_recipient != address(0) && _recipient != address(this));
    _;
  }

}

随后使用Remix部署合约，然而私链终端需要对交易进行打包，解锁账户，开始挖矿。

安装PostgreSQL和docker，这里不细说。PostgreSQL的安装过程具体可以看这篇文章：技术|如何在 Ubuntu 上安装和配置 PostgreSQL (linux.cn)。

我使用的PostgreSQL版本和docker版本如下：

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keikei@ubuntu:~$ psql --version
psql (PostgreSQL) 12.14 (Ubuntu 12.14-0ubuntu0.20.04.1)
keikei@ubuntu:~$ docker version
Client: Docker Engine - Community
 Version:           23.0.1
 API version:       1.42
 Go version:        go1.19.5
 Git commit:        a5ee5b1
 Built:             Thu Feb  9 19:46:56 2023
 OS/Arch:           linux/amd64
 Context:           default
permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/version": dial unix /var/run/docker.sock: connect: permission denied

随后在~/myChain/chainlink/.chainlink下创建.env文件

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ROOT=/chainlink
LOG_LEVEL=debug
ETH_CHAIN_ID=4190
CHAINLINK_TLS_PORT=0
LINK_CONTRACT_ADDRESS=0x2C8ed9723635a66597Ee5f94E626453A3528fE26
SECURE_COOKIES=false
ALLOW_ORIGINS=*
ETH_URL=ws://127.0.0.1:8546
DATABASE_URL=postgresql://postgres:Likeqi5201314000@localhost:5432/chainlink?sslmode=disable
DATABASE_TIMEOUT=0

随后启动预言机

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docker run --net host -u=root  -p 6688:6688 -v ~/.chainlink:/chainlink -it --env-file=.env smartcontract/chainlink:1.11.0 local n

在本地浏览器输入127.0.0.1:6688，打开Chainlink Operator

至此，Chainlink分布式预言机节点已经搭建完毕。